Abstract
Abstract The influence of a new heat treatment, “Intercritical Hardening”, on mechanical properties, microstructure and sulfide cracking behavior of C-75, 4140, and 4340 steels is described. This treatment involves heating above the lower critical AC1 temperature. Heating above the AC1 temperature introduced untempered martensite and drastically lowered sulfide cracking resistance. Newly formed martensite was then eliminated by tempering below the AC1 temperature. Tempering below AC1 after intercritical hardening increased strength and ductility and dramatically improved sulfide cracking resistance. Highest strength consistent with immunity to sulfide cracking was developed by the 4340 steel due to the fact that nickel lowered the initial temperature required to develop fresh martensite.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
